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Division members promote the advancement of mathematical and computational methods for solving problems arising in all disciplines encompassed by the Society. They place particular emphasis on numerical techniques for efficient computer applications to aid in the dissemination, integration, and proper use of computer codes, including preparation of computational benchmark and development of standards for computing practices, and to encourage the development on new computer codes and broaden their use.
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Framatome signs contracts with Sizewell C
French nuclear developer Framatome is slated to deliver key equipment for Sizewell C Ltd.’s two large reactors planned for the United Kingdom’s Suffolk coast.
The agreement, reportedly worth multiple billions of euros, was announced this week and will involve Framatome from the design phase until commissioning. The company also agreed to a long-term fuel supply deal. Framatome is 80.5 percent owned by France’s EDF and 19.5 percent owned by Mitsubishi Heavy Industries.
Yoon Sub Sim
Nuclear Technology | Volume 156 | Number 3 | December 2006 | Pages 289-302
Technical Paper | Thermal Hydraulics | doi.org/10.13182/NT06-A3792
Articles are hosted by Taylor and Francis Online.
In a thermal-hydraulic analysis for nuclear application, a one-dimensional analysis is widely used. In the analysis, averaging is required for the calculation of the cell property, and the accuracy of the averaging directly influences the accuracy of a numerical scheme. While the average value depends on the property distribution characteristics in a cell, conventional numerical schemes do not utilize the information. Instead, they rely on the use of a large number of nodes for their accuracy. There are many cases where the use of a large number of nodes is not practically allowed, especially in a transient system analysis, and the calculation results come to suffer from a large truncation error. To overcome the drawbacks of the conventional schemes, a new approach is introduced to reduce the truncation error by utilizing the distribution characteristics in a cell for the required averaging. The new approach places a node point at the boundary of a calculation cell and averaging is achieved from the properties at the inlet and outlet by using weighting factors that are determined from the cell property distribution. By this approach, it was successful to describe more accurately even a transient where the property distribution was stepwise. Steady-state calculation for a once-through steam generator where the feedwater is heated to superheated steam was accurately carried out with only three calculational nodes. The characteristics and achievements of the new approach are described.